Example 1 Lifting an Object
Determine the work done in lifting a 50-pound object 4
feet.
Solution: The
magnitude of the required force F is the
weight of the object (50 pounds). So, the work done is
lifting the object 4 feet is ;
W
= FD Work
= (force)(distance) .
= 50(4) Force
= 50 Pounds, Distance = 4 Feet
= 200 foot- pounds. |